fix: don't use the default GitHub token for Enterprise

The token on Enterprise instances is not valid for github.com.

Resolves #196.

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -28,7 +28,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -42,7 +42,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -58,7 +58,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
     - run: nix flake show github:NixOS/nixpkgs
@@ -69,7 +69,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -84,7 +84,7 @@ jobs:
           os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -98,7 +98,7 @@ jobs:
           os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - run: curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
     - run: docker pull ghcr.io/catthehacker/ubuntu:js-20.04
     - run: ./bin/act -P ubuntu-latest=ghcr.io/catthehacker/ubuntu:js-20.04 push -j simple-build

install-nix.sh

@@ -25,11 +25,18 @@ if [[ $OSTYPE =~ darwin ]]; then
 fi
 # Allow binary caches for user
 add_config "trusted-users = root ${USER:-}"
-# Add github access token
+# Add a GitHub access token.
+# Token-less access is subject to lower rate limits.
 if [[ -n "${INPUT_GITHUB_ACCESS_TOKEN:-}" ]]; then
+  echo "::debug::Using the provided github_access_token for github.com"
   add_config "access-tokens = github.com=$INPUT_GITHUB_ACCESS_TOKEN"
-elif [[ -n "${GITHUB_TOKEN:-}" ]]; then
+# Use the default GitHub token if available.
+# Skip this step if running an Enterprise instance. The default token there does not work for github.com.
+elif [[ -n "${GITHUB_TOKEN:-}" && $GITHUB_SERVER_URL == "https://github.com" ]]; then
+  echo "::debug::Using the default GITHUB_TOKEN for github.com"
   add_config "access-tokens = github.com=$GITHUB_TOKEN"
+else
+  echo "::debug::Continuing without a GitHub access token"
 fi
 # Append extra nix configuration if provided
 if [[ -n "${INPUT_EXTRA_NIX_CONFIG:-}" ]]; then